31020021312113 has 2 divisors, whose sum is σ = 31020021312114. Its totient is φ = 31020021312112.

The previous prime is 31020021312079. The next prime is 31020021312143. The reversal of 31020021312113 is 31121312002013.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22674815428864 + 8345205883249 = 4761808^2 + 2888807^2 .

It is a cyclic number.

It is not a de Polignac number, because 31020021312113 - 2⁴⁴ = 13427835267697 is a prime.

It is not a weakly prime, because it can be changed into another prime (31020021312143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15510010656056 + 15510010656057.

It is an arithmetic number, because the mean of its divisors is an integer number (15510010656057).

Almost surely, 2^{31020021312113} is an apocalyptic number.

It is an amenable number.

31020021312113 is a deficient number, since it is larger than the sum of its proper divisors (1).

31020021312113 is an equidigital number, since it uses as much as digits as its factorization.

31020021312113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 31020021312113 its reverse (31121312002013), we get a palindrome (62141333314126).

The spelling of 31020021312113 in words is "thirty-one trillion, twenty billion, twenty-one million, three hundred twelve thousand, one hundred thirteen".